Half-Tried Deity - Chapter 111

In a world where magic is a science, Siobhan is a genius.But even geniuses need schooling.When Siobhan stumbled into the theft of a priceless magical book, she thought her dreams of becoming the world's most powerful sorcerer were destroyed.But then a mysterious spell changed her life forever...Siobhan is now wearing the body of a strange man and has a new identity—Sebastien. With a new chance for a new start, she allies herself with a local gang—secretly a revolutionary party funding itself through crime. Now, she is bound by vow to repay them in magic and favors. But as Sebastien's reputation begins to bloom, and Siobhan's old enemies still lurk in the shadows, she quickly realizes that the secrets of this world are deeper and darker than she ever could have imagined.Forced to juggle the two sides of her double life, Siobhan is determined to uncover the truth and take control of the name they gave her - The Raven Queen.

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

A teenager who unexpectedly gets transported to the modern world from ‘the world of the immortals’ . He finds himself in the body of an ordinary guy. He wants to go back to his world and for that, he will have to practice to get stronger and investigate the reason why and how he crossed through to this world.

- Description from Novelupdates

Zhao Yesui runs a private custom shop, and his job is to customize death for others.

On a certain day of a certain year, when he customized an exclusive death for a customer as always, he found himself involved in a game of death with no end in sight.

What surprised Zhao Yeshi even more was that, unlike other players, he seemed to be able to extract identities in the game?

However, as he extracted more and more identities, trouble also followed.

The NPCs in the game… chased after him in reality.

Not only that, but many of his identities are also known to everyone by word of mouth.

Such as Legendary Investigator, Unthinking Juggernaut, Archon of Fantasy Kingdom, Lord of Steam, Weaver of Fate, Loving Father, Lord of Death and Soul, etc.

And those women with prestigious titles also followed, the queen of the fantasy country, the ruling angel who called herself a bad woman, the immortal of Shenzhou who inherited the precious blood…

In this regard, Zhao Yejia could only deny it righteously, and packed up and ran away to escape the end of his own blood.

- Description from novelbuddy